December 2011
Intermediate to advanced
485 pages
15h 47m
English
Content preview from OS X and iOS Kernel ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Serial Port Events
The hardware serial port will need to be configured to match the settings used by the device on the other end of the serial connection. Configurable settings include parameters such as the baud rate at which data is sent, the number of bits in a data character, whether parity bits are transmitted, and the number of stop bits that are sent at the end of each character.
These serial port settings are determined by the user space process that has opened the serial port and are configured through functions such as tcsetattr() and tcgetattr(). These functions enter the kernel through the I/O Kit's IOSerialBSDClient class, which passes the individual configuration options to the serial port driver through its executeEvent() method. ...
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